Prevention and Control of Flower Powdery Mildew
This article provides a detailed introduction to flower clinic, the prevention and control of flower powdery mildew, and will take everyone to understand together.
Recently, I have seen many flower friends' gardens affected by powdery mildew, and I was still grateful that my garden and the garden of my lazy friends had not appeared, and the flowers were very healthy. However, just yesterday, in the afternoon and evening, half of the flowers in the garden had powdery mildew!!! Including roses, shrubs, perennial roots, and aquatic plants, completely regardless of variety.
When we went to the garden in the morning, ready to work hard, we were completely scared. We have always regarded the flowers as our own children, taking care of them every day, and now suddenly there is such a large-scale powdery mildew, which made us very, very sad and nervous.
So I immediately drove back home, first looked for a gardening encyclopedia, which was very general and completely useless. Then I found the phone numbers of Professor Gao from the Rose Garden, Dr. Ding Liang from the Breeding Base, and Liu Garden's Director from Dongsheng, and called them one by one in detail. Finally, I felt comfortable in my heart, as it turned out that powdery mildew was not unsolvable or unpreventable, and there were also many parts that needed attention in daily life. As long as all these are done well, it should be fine.
Here are the suggestions from the three of them in detail:
1. The reasons for powdery mildew and how to improve and prevent watering methods.
The reasons for occurrence are one: high temperature and stuffiness, and another more important reason is: do not water at night, especially sprinkling!!! This is the main reason for the powdery mildew in our garden, because we always water at night and use the sprinkling method.
Both Professor Gao and Dr. Ding mentioned this part. As soon as I said I had a large-scale powdery mildew, they immediately asked if I watered at night. Because watering at night, especially sprinkling, the water on the leaves cannot dry and evaporate quickly at night, the humidity is too high, and it is very easy to cause fungal problems like powdery mildew. The most suitable time for watering is 7-8 a.m., and it should not exceed 9 a.m. so that the sunlight during the day can quickly evaporate the water on the leaves.
Also, for sauna weather, the sprinkling method is not suitable. The most appropriate method is to water directly at the roots or seepage, so that the water does not get on the leaves. Professor Gao and the Breeding Base both use this method, so they can largely avoid powdery mildew.
Spraying or sprinkling water on plants is only suitable for supplementing water after spring windy weather. In Beijing's sauna weather, the humidity during the day is at least 70%, which is very unsuitable for sprinkling water on the leaves.
I remember a while ago, I read a foreign gardening book, and there was a special mention of the part about automatic irrigation systems, which said that it is best to use seepage pipes instead of micro-sprinkler pipes to avoid getting the leaves wet. At the time, I didn't quite understand because I thought the flowers would be happy to be sprayed with water. Now I finally understand. The humidity of sauna weather has already made the plants uncomfortable, and sprinkling water, even in the morning, will only make them more uncomfortable.
2. Medication and frequency after powdery mildew occurs
According to the joint suggestions of the three: if it has already occurred, it is no longer suitable to use chlorothalonil alone, because using it alone is only suitable for prevention, not treatment. carbendazim is also not good, and its effect is even less than chlorothalonil.
The most suitable formula is as follows (this is the best formula recommended by all three): After occurrence, the first spray: trizole (also known as sanzhuacopper, no imported, only domestic) + chlorothalonil (imported is better) mixed together, the concentration can be slightly higher. Four days later, spray again with the same formula. Continue this method for about 3 to 4 times. It should be basically cured.
3. Suitable spraying time
It is most suitable after dusk to avoid the hot sun quickly drying the water in the medicine, causing the drug components to concentrate unevenly on the leaves and easily causing leaf burns. After spraying in the evening, if you water in the morning, you can use a spray method once to rinse off the white medicine powder on the leaves. Don't worry about this affecting the efficacy, because Dr. Ding said that keeping it for 4 hours is enough. According to the old man in the agricultural supply store, after rinsing it, the medicine enters the soil and can be further absorbed by the plant to take effect.
4. Preventive spraying method
After spraying the treatment formula three to four times (about a month later), you need to change to a new formula and cannot continue to use the old formula. The new formula can use chlorothalonil and methyltoproline mixed together, also continuing for a month, about once a week. After a month, switch to another broad-spectrum medicine, which is available at many agricultural supply stores, both imported and domestic. Just keep changing and using it in one-month cycles. This needs to continue until after October 1st, when the weather cools down, and then it can be stopped.
At night, we have given all the flowers medicine according to this formula, and I will get up at 7 o'clock in the morning without being lazy. I will report back to everyone if there is any effect! I hope this can help flower friends with powdery mildew at home!
The above information provides a detailed explanation of the prevention and control of flower powdery mildew (for flower friends) for reference only!